Solutions Test 30

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Solutions Test 30

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Weekly Quiz Competition

Question 1
1 / -0

The vapour pressure of $$1$$ molal glucose solution at $$100^{o}C$$ will be

A
$$760\ mmHg$$

B
$$76.0\ mmHg$$

C
$$1\ atm$$

D
$$746.32\ mmHg$$

Solution
Question 2
1 / -0

The lowering of vapour pressure of 0.1 M aqueous solutions of $$NaCl,\ CuS{O_4}$$ and $${K_2}S{O_4}$$ are ;

A
all equal

B
in the ratio of 1 : 1 : 1.5

C
in the ratio of 3 : 2 : 1

D
in the ratio of 1.5 : 1 : 2.5
Question 3
1 / -0

At a certain temperature pure liquid A and liquid B have vapour pressures 10 torr and 37 torr respectively. For a certain ideal solution of A and B, the vapour in equilibrium with the liquid has the components A and B in the partial pressure ratio $$P_A : P_B=1 : 7 $$. What is the mole fraction of A in the solution?

A
0.346

B
0.654

C
0.5

D
None of these

Solution
Question 4
1 / -0

Vapour pressure increase with increase in :

A
Concentration of solution containing non-volatile soulute

B
Temperature up to boiling point

C
Temperature upto triple point

D
Altitude of the concerned place of boiling

Solution
Question 5
1 / -0

Vapour pressure of pure 'A' is 70 mm of Hg at $$25^0C$$ it forms an ideal solution is with 'B' in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm is Hg at $$25^0C$$, the vapour pressure of pure 'B' at $$25^0C$$ is :

A
56 mm Hg

B
70 mm Hg

C
140 mm Hg

D
28 mm Hg
Question 6
1 / -0

A mixture of $$H_2SO_4$$ and $$H_2C_2O_4$$ (oxalic acid) and some inert impurity weighing 3.185g was dissolved in water and the solution was made up to 1litre. 10mL of this solution required 3mL of 0.1N $$NaOH$$ for complete neutralization. In another experiment, 100mL of the same solution in hot conditions requires 4mL of 0.02M $$KMnO_4$$ solution for complete reaction.
The weight % of $$H_2SO_4$$ in the mixture was:-

A
40

B
50

C
60

D
80

Solution
Question 7
1 / -0

Which of the following have least vapour pressure?

A
$$0.1\ M\ NaCl\ sol$$

B
$$0.1\ M\ urea\ sol$$

C
$$0.1\ M\ AlCl_{3}\ sol$$

D
$$0.1\ M\ KCl\ sol$$
Question 8
1 / -0

The possible van't Hoff factor for sodium chloride in water assuming sodium chloride is partially ionized:

A
$$0.5$$

B
$$0.75$$

C
$$2.5$$

D
$$1.5$$
Question 9
1 / -0

A $$10\%$$ solution of $$NaCl$$ means that in $$100g$$ of solution there is:

A
$$5.85g\ NaCl$$

B
$$58.5g\ NaCl$$

C
$$10g\ NaCl$$

D
$$94g\ NaCl$$

Solution
Question 10
1 / -0

When 20g of napthoic acid ($$C_{11}H_8O_2$$) is dissolved in 50g of benzene ($$K_f=1.72K kg/mol$$), a freezing point depression of 2K is observed. The van't Hoff factor $$(i)$$ is:

A
0.5

B
1

C
2

D
3